Method of making webs for brake shoes



Feb. 6, 1934. c. E. BUDD 1,946,051 IETHOD O1" MAKING WEBS FOR BRAKE SHOES Filed April 27, 1931 INVENTORQ v FIG.'3 CLARENCE E. BUDD' ATTORNEY.

Patented Feb. 6, 1934 METHOD OF MAKING WEBS FOR BRAK SHOES Clarence name, small we, mm, m: a;

Bendix Brake Company, South corporation of Illinois Bend, Incl, a

Application April 27, 1931. Serial No. 533,254 3 Claims. (Ci. 29-152.!)

This invention relates to the method of making webs for brake shoes.

Heretofore, in the manufacture of brake shoes, and more particularly in the production of the web or reinforcing member of the shoe, considerable waste in material has occurred due to the particular shape or form of the web or reinforcing member. This loss of material is largely due to the difference in the radii of the inner and i0 outer perimeter of the web which does not permit stamping these members without an excessive loss in material.

The present invention aims to overcome this difllculty by providing a method for producing, brake shoes, particularly the webs of the shoes, by stamping sheet metal in strips and deforming I the strips to produce a member of the general contour desired. Broadly, the invention comprehends stamping sheet metal in strips and bending the strips by stretching one edge and compressing the other edge while the strip is maintained under pressure to prevent warping or twisting.

An object of the invention is to provide a method for manufacturing webs or reinforcing: members of brake shoes wherein substantially no waste of material occurs in the production of the finished product.

Other objects and advantages of the invention will appear from the following description taken in connection with the drawing, which forms a part of this specification, and in which:

Figure l is a plan view of a sheet of metal partly broken away, and illustrating the sheared or cut lines; I

Figure 2 is a top plan view of a table supporting a stack of strips and a movablemember for bending the strips;

Figure 3 is a top plan view of the strips on the table after bending;

Figure 4 is a sectional view substantially on line 4-4, Figure 2;

Figure 5 is a side elevation of a finished web or reinforcing member; and

Figure 6 is a side elevation of a complete-shoe. It has been found that in the production of the webs or reinforcing members for brake shoes considerable savings may be had by stamping or shearing a sheet of metal such as is indicated at 10 transversely of the grain of the metal substantially on the lines indicated at 12 to provide strips.

The strips are placed on a table 14 having thereon spaced rotatable stops 16. As shown, the stops have polygonal sided heads 18, and the strips are arranged in stacks as at 20 with one edge of the stack against the heads, the stops being adjacent the respective ends of the stack. ,With the stack in this position it is compressed on the table by a slidable member 22 retained to in close engagement with the table by suitable means such as a strip 24. The movable member 22 has a projecting end portion 26 provided with an undercutbevelled portion 28 terminating in a flat surface 30 parallel to the face of the table. 65 On the initial movement of the member 22 the bevelled portion 28 rides over the stack and compresses the stack on the table. The surface 30 is at right angles to a shoulder 32, and the shoulder 32 vis substantially semi- I0 circular as shown in. Figure 2, so that upon further movement of the member 22' against the stack of 4 plates 20 the plates are deformed by stretching one edge and compressing the other edge. I 76' The plates are cu transversely of the grain. of the material, hence they will readily yield to the applied force, and as the force is applied substantially centrally of the length of the plates and centrally with respect to the stops 16 the so bending or deformation of the plates will be uniform. The stops rotate sumciently to permit the bending or deformation of the plates without disengagement.

When the initial force is applied to slide the member 22, the projecting end portion 26 on the member22 rides smoothly over the stack of plates 20. Since this member 22 has a bevelled portion 28, the stack will be gradually compressed and is retainedunder pressure by the surface 0 30 parallel to the table 14. when in this position the stack is held against warping or buckling, and upon further movement of the member 22 the stack is deformed.

when the stack has been deformed, the indi- 95: vidual strips take the form substantially as indicated 34. The strips so bent are again stamped to provide a plurality of spaced allocating lugs 36 and suitable shouldered and anchorin ends as shown at 38 and 40. v

A ring 42 is then punched and bent to fit upon the outer periphery of the web or reinforcing member and is spot-welded or otherwise secured thereto, and suitably secured to the rim is a friction lining 44. i

Although this invention has been described in connection with certain specific embodiments, the principles involved are susceptible ofnumerous other applications that will readily occur to persons skilled in the art. The invention is, no

therefore, to be limited only as indicated by the scope of the appended claims.

Having thus described the invention, what I claim as newand. desire to secure by Letters Patent is: V I

1. A m'ethod'for manufacturing webs for brake shoes comprising stamping strips of metal transversely of the grain of the metal and deforming the strip by stretching one edge and compressing the other.

2. A method for manufacturing webs for brake.

shoes comprising cutting strips'o! metal from a sheet crosswise 01' the grain or the metal. oompressing the strips in stacks and deforming the stack by stretching one edge and longitudinally compressing the other edge.

3. A method for manufacturing webs tor brake shoescomprising cutting strips of metal from a sheet crosswise of "the grain of themetal, arranging the strips in stacks, compressing the stack and applying force to the stack between the ends of the strips to deform the stack. by stretching one edge and shortening the other edge.

' CLARENCE E. BUDD. 

